You need to provide an option to use the high channel 5ghz bndwidth for fronthaul traffic when all mesh nodes are wired.
A toggle switch in the software: Backhaul type: Wireless / Wired
For a wired backhaul, users must ensure all mesh nodes are propery connected via ethernet. Then, the upper channels should be made available for assignment in the 5ghz wireless setup section.
This also should disabled the hidden 5ghz, which is currently blasting away for no reason in wired backhaul scenarios.
You need to do this. Put it under advanced settings
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